Knob.



PATENTED DEC. 24, 1907.

G. B. PIGKOP.

V KNOB. APPLICATION FILED JULY 26. 1907.

wi if naweo ms NORRIS FE UNIED STATES PATENT OFFICE.

GEORGE B. PICKOP, OF NEW BRITAIN, CONNECTICUT, ASSIGNCR TO P. &. F.CORBIN, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

KNOB

Specification of Letters Patent.

Patented Dec. 24:, 1907.

Application filed July 26, 1907. Serial No. 385,659.

To all whom it may concern:

Be it known that I, GEORGE B. PIGKOP, a citizen of the United States,residing at New Britain, county of Hartford, Connecticut, have inventedcertain new and useful Improvements in Knobs, of which the following isa full, clear, and exact description.

My invention relates to improvements in knobs, and particularly to animproved filling for the knob shank, by the use of which severaladvantages are attained, including a reduction in initial cost, lessweight, greater uniformity of product, less liability of binding screwworking loose, and greater speed in manufacture.

In the drawings Figure 1 is a longitudinal section of a portion of aknob and knob spindle, as the same appear in practice. Fig. 2 is a crosssection of the filling piece, detached. Fig. 3 is a side elevation ofthe filling piece, looking from right to left. Fig. 4 is a cross sectionof the knob shank spindle and filling piece, assembled.

1 represents a portion of a knob.

2 is the knob shank, of conventional form.

3 is the binding screw which passes through the knob shank and takesinto a screw-threaded passage in the knob spindle 4.

Because the shank of the knob is considerably larger than the spindle 4,it is necessary to have a filling piece. This filling piece not onlyreinforces the knob shank, but also acts as a bearing for the spindle.My improved filling piece is formed of a parallel sided strip of wroughtmetal bent into the shape best seen inFig. 2, the outside beingcircular, the inside being of a suitable contour to receive the end ofthe .spindle 4, so as to prevent the independent turning of the spindlein the knob.

5 represents the cylindrical outer wall of the filling and 66 representthe angular inner wall of the filling.

7 is a screw-passage through the outer wall 5, while 8 is ascrew-passage through one of the inner walls 6.

The knob shank filling may be inserted into the knob shank and snuglyfits the same.

'When in place, a portion of the knob shank,

indicated at 9, is spun or forced down into the opening 7 in the outerwall of the filling piece, securely anchoring the same, and alsofurnishing a countersunk seat for the head of the screw 3. Thus far, itwill be seen that .struction.

vent the jarring loose of the screw 3.

knob shank fillings constructed as aforesaid may be very rapidlyproduced with little cost and of very light yet very strong con- In thepreferable form of the filling piece its construction is such that itserves the purpose of a spring washer to pre This end is accomplished byleaving a slight space between the angle of the inner members 6 and theouter member 5 of the filling piece. This space is seen in Fig. 2. Whenthe screw is inserted, it draws against the outer side of the knob shankand against the spindle 4. As the screw is set up, the drag of the screwis in a direction to spring the adjacent side of the inner wall of thefilling, so as to put a yielding strain at all times upon thescrewthread, thereby frictionally retaining the screw against danger ofdisplacement by reason of jarring. wall 6 of the knob shank when theknob 1 and screw 3 and spindle 4 are in place, is shown in the sectionview, Fig. 4, and on comparison with the position of the same part shownin Fig. 2, it will be observed how the inner wall is sprung by thedragging action of the screw.

The knob shank filling is preferably made in one piece or strip, but Ido not desire to limit myself to this particular form. hen made in onepiece, the ends of the strip are bent at a suitable angle, so that whenthe strip is rolled up into the form shown, these angles will form aspace between them corresponding substantially to the cross section ofthe spindle which it is intended to employ, the extreme ends of thestrip being located within the surrounding circular wall of the fillingpiece formed by bending it to a shape corresponding to and adapted tofit within-the shank 2.

l/Vhat I claim is 1. A knob shank filling comprising a circular outerwall arranged to fit within the knob shank, and an angular yieldinginner wall arranged to receive a spindle of angular cross section, andspaces between the outer wall and inner wall of the filling, to provideclearance to permit said wall to yield.

2. A knob shank filling comprising a wrought metal strip bent to form anouter wall of cylindrical form and an inner wall of angular form.

3. A knob shank filling comprising a cy- The position of the innerlindrical outer Wall, and an angular inner inner Wall adapted to a knobspindle, and a wall, said Walls being spaced apart but sescrew-passageextending through the knob cured together at one point. shank and boththe inner and outer Wall of 4 A knob shank filling comprising a cyl theknob shank filling one of said Walls ad- 15 lindrical outer Wall, anangular inner Wall, jacent to the screw passage 'in the knob and meansfor yieldingly supporting the anshank being yielding. gular innlclerWall relatively to the cylindrical GEORGE B PIOKOP outer Wa 5. In aknob, a hollow shank, a filling Witnesses: piece therein comprising anouter Wall i/VM. V. COLLINS, adapted to the knob shank, and an angularG. E. ROOT.

